body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    color: #fff;
    background: url('https://images.unsplash.com/photo-1507525428034-b723cf961d3e?fit=crop&w=1920&q=80') no-repeat center center fixed;
    background-size: cover;
}

.overlay {
    background-color: rgba(0, 0, 0, 0.6);
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
}

h1 {
    font-size: 3rem;
    margin: 0.5rem 0;
}

p {
    font-size: 1.2rem;
    max-width: 600px;
}

.countdown {
    margin-top: 2rem;
    font-weight: bold;
    font-size: 1.5rem;
}

@media (max-width: 600px) {
    h1 { font-size: 2rem; }
    p, .countdown { font-size: 1rem; }
}